磷酸铁锂作为可充电锂电池电极材料的傅里叶变换红外光谱特征

FTIR features of lithium-iron phosphates as electrode materials for rechargeable lithium batteries.

作者信息

Ait Salah A, Jozwiak P, Zaghib K, Garbarczyk J, Gendron F, Mauger A, Julien C M

机构信息

Institut des Nano-Sciences de Paris, UMR-CNRS 7588, Université Pierre et Marie Curie, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2006 Dec;65(5):1007-13. doi: 10.1016/j.saa.2006.01.019. Epub 2006 May 22.

DOI:10.1016/j.saa.2006.01.019

PMID:16716657

Abstract

The essential structural features of lithium-metal phosphates (LMP) have been studied using FTIR spectroscopy which is a sensitive tool to probe the local environment in the solid materials. Various LMP materials where M is iron have been investigated including phospho-olivine LiFePO(4), diphosphate LiFeP(2)O(7), Nasicon-type phosphate Li(3)Fe(2)(PO(4))(3) and dihydrate FePO(4).2H(2)O. Vitreous and amorphous materials are also considered. Analysis of internal and external modes of vibration allows to distinguish between the different phases and the type of cationic environment in the framework. Results corroborate the contribution of the main factors which are responsible for the complexity of the spectra, i.e. departure from ideal symmetry, interactions between polyhedra, bridging atoms and lattice distortion.

摘要

利用傅里叶变换红外光谱（FTIR）对锂金属磷酸盐（LMP）的基本结构特征进行了研究，FTIR是探测固体材料局部环境的一种灵敏工具。已对各种M为铁的LMP材料进行了研究，包括磷酸橄榄石LiFePO₄、二磷酸盐LiFeP₂O₇、NASICON型磷酸盐Li₃Fe₂(PO₄)₃和二水合物FePO₄·2H₂O。还考虑了玻璃态和非晶态材料。对内部和外部振动模式的分析有助于区分不同相以及骨架中阳离子环境的类型。结果证实了导致光谱复杂性的主要因素的作用，即偏离理想对称性、多面体之间的相互作用、桥连原子和晶格畸变。